Joint for leg-rests.



E. PIGKART.

JOINT POR LEG RESTS.

APPLIOATION FILED MAB. 2a, 1910.

Patented Dec.20, 1910.

UNITED STA'IES PATENT F ICE..

EMIL PICKART, OF HAMMOND, INDIANA, ASSIGNOR TO FRANK S. BETZ, OF HAB'IMOND, INDIANA.

JOINT FOR LEG-BESTS.

Application filed March 2E, 1910.

To all whom t may concern:

Be it known that I, EMIL PIGKART, a citi- Zen of the United States of America, and a resident of Hammond, county of Lake, `State of Indiana, have invented certain new and useful Improvements in Joints for Leg- Rests, of which the following is a specification.

The main objects of this invention are to provide improved means for supporting the .I

leg rests of surgeons operating tables; to provide an improved joint whereby a part may be moved longitudinally or rotate about both longitudinal and transverse axes, or describe directly the resultant of all of said movements; to provide an improved locking device in which one movement of a single element will prevent all of said movements; and to provide a compact construction for a joint accomplishing` such movements.

A specific construction embodying this invention is illustrated in the accompanying drawings, in which:

Figure 1 is a front elevation showing this invention as applied to an operating` table for supporting a foot rest. Fig. 2 is a side elevation of the same, omitting the table. Fig. 3 is a section taken on the line 3 3 of Fig. 1. Fig. t is a section taken on the line 4 -1 of Fig. 1, showing the details of the locking mechanism.

In the construction shown in the drawings, there is a fixed member 1 in the form of a fiat plate fastened to the corner 2 of an operating table or chair. A split sleeve 3 is pivoted in an aperture A which is located at the center of a slotted arc 5. The pivot G is integral with the sleeve 3, and is held in place by means of a cotter pin or key 7. A U-shaped yoke S surrounds t-he split sleeve 3, and its legs extend through the slotted arc 5 and are connected behind the fixed member 1 by means of the foot plate 9, which is secured to the yoke legs by means of a pin 10. The bow of the yoke 8 is tapped and threaded to receive a set screw 11 which has a handle 12. There is an advantage in having broad bearing surfaces between the xed member 1 and the sleeve 3, and between said member and the plate 9, as the security of the joint depends upon friction.

The locking mechanism consists of the screw 11, which bears directly on the sleeve Specification of Letters Patent.

Patented'lec. 29, 1910.

Serial No. 552,086.

3, and, through the resulting tension on the yoke 8, draws the foot plate 9 into frictional contact with the fixed member 1. A round rod or shaft 13 is supported in the sleeve 3, and is gripped by the inner faces of the sleeve 3 through the direct action of the screw 11 on the sleeve. The inner sleeve faces are made yielding by means of a longitudinal slot 14 cut in the sleeve at right angles to the axis of the screw 11. The slot I 14C does not entirely separate the sleeve into two parts, and the uncut portion of the sleeve acts as a spring to normally hold the cut portions in original position.

13 carries an adjustable foot rest 15.

In operation, the foot rest is set free for adjustment to any required position by a turn of the lever handle 12. In the construction here shown, a left hand turn to the screw 11 removes the compression between the inner sleeve faces and the rod 13, and at the same time loosens the yoke S and removes the compression between the foot plate 9 and the member l. With one hand, the operator moves the foot rest 15 into any desired position by either the rotation of the rod 13 about its own axis or by sliding the rod 13 through the sleeve or by rotation of the sleeve on its pivot 6, or by a combination of all thee movements, and then by a right hand rotation to the lever handle 12 locks all the parts against relative motion.

Although but one specific embodiment of this invention is herein shown, it will be understood that numerous details of the construction shown may be altered or omitted without departing from the spirit of this invention.

I claim 1. The combination of a member having a slotted arc, a compressible sleeve pivoted thereto, a rod extending through said sleeve and slidable and rotatable therein, a yoke embracing said sleeve and slidably engaging said member at said slotted arc, and a locking element carried by said yoke and arranged to hold all of said parts against relative movement.

The rod l 2. The combination of a member having yoke for compressing said sleeve upon Said rocl and locking Said sleeve to said irst named member.

3. rlhe combination of a member, a sleeve pivotally mounted on said member, a yoke embracing said Sleeve and slirlably connected to said member, a rod rotatable in saicl sleeve and axially Sltlable therein, and. means acting between said yoke and sleeve to sii'nultaneonsly look said parts to prevent relative movement of said rod and member.

4. The combination of a member7 a split sleeve pivotally mounted on said member, a. yoke embraein' Said sleeve and sliflably conneetefl to Said member, a rod rotatable in Said lsleeve and axially sliclable therein, and means acting between said yoke and Sleeve to simultaneously look said parte to prevent relative movement of said roel and member.

5. The combination of a Stationary member having va slotted are, a Split Sleeve pivotecl at the center of said are, a roel Sliclable and rotatable in Said. sleeve, a member movable in Said are and having` a part einbracing said sleeve, and looking means carried by said member and arranged to compress said sleeve and Secure the same to said stationary member at Said slotted are.

6. The Combination of a. member, a split sleeve having a transverse pivot j ournaled in said member', a Shaft carried in Said sleeve, a yoke embracing` Said. sleeve and member, and a. locking` screw carried by Said yoke and adapted to cause the same to prevent relative motion of all said parte.

7. The combination of a member havingl a pivot aperture and a Slotted are, a split Sleeve having an integral pivot journalecl in said aperture, a roel carried in Said Sleeve and adapted to slide and rotate in said sleeve, a yoke embracing said Sleeve and slidably engaging said member at said slotted are, and a locking element Carried by said yoke and adapted to prevent the relative motion or' all of said parte.

Signed at Chicago this 23rd clay of February 1910.

EMIL PICKART.

lllitnesses:

EDWIN PHELPS, PETER HELMER. 

